If this helps, it's designed for unstructured information storage, so fundamentally you use it as you'd use a notebook with the exception that organisation is something you can do ad-hoc. For example ...

OneNote is a robust note-taking app that integrates with Microsoft 365 but can also be used on its own for free. Here’s how to get up and running with it quickly. A note-taking app can be helpful, ...

Ever find yourself drowning in a sea of notes, ideas, and to-do lists, wondering how to keep everything organized? You’re not alone. Many of us struggle with managing our information efficiently. But ...